A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

The small sanctuaries lie just off the beaten path near one of Bhutan's most famous attractions.

The luxurious circular mansion built for a Communist leader now lies abandoned.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

A scenic canyon with thick forests and historic ruins.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

The last standing example of an ancient district's teatime tradition.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

A museum glorifying the life of Stalin, located in the city of his birth.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Unusual building appears to be haphazardly built from randomly piled bricks.

These Stalin-era industrial 'death traps' hang lifeless above the city

The charmingly disheveled clock tower of Tbilisi's puppet theater.